CN105060836B - Heat-insulated lining concrete in High-geotemperature tunnel and preparation method thereof - Google Patents
Heat-insulated lining concrete in High-geotemperature tunnel and preparation method thereof Download PDFInfo
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- CN105060836B CN105060836B CN201510520397.1A CN201510520397A CN105060836B CN 105060836 B CN105060836 B CN 105060836B CN 201510520397 A CN201510520397 A CN 201510520397A CN 105060836 B CN105060836 B CN 105060836B
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Abstract
The invention belongs to civil engineering material neck technology domain, and in particular to a kind of heat-insulated lining concrete in High-geotemperature tunnel, 1m3Contained raw materials quality is：300～380kg of cement, 850～1000kg of coarse aggregate, 450～550kg of sand, 200～220kg of waterglass, 8～12kg of glass bead, II grade of 50～150kg of flyash, 40～80kg of steel fibre, third solidifying 3～5kg, 2～3kg of high performance water reducing agent of polyocarboxy acid.The heat-insulated lining concrete in High-geotemperature tunnel that the present invention is provided, surrounding rock supporting and heat-insulated combine, reduce the difficulty of constructing tunnel, under High-geotemperature environment, with good heat-proof quality, while intensity will not be reduced, the concrete strength after hardening is higher, the intensity requirement of lining concrete can be reached, the mechanical property under the conditions of concrete High-geotemperature is improved；The concrete has good waterproof, crack resistence performance simultaneously.
Description
Technical field
The invention belongs to civil engineering material neck technology domain, and in particular to a kind of heat-insulated lining concrete in High-geotemperature tunnel and
Its preparation method.
Background technology
At present, with the construction of highway in China and railway, many engineerings will be passed through mountain area and be built deep-lying long tunnels engineering, this
A little engineerings inevitably pass through high temperature hyperpyrexia location.To ensure the operation in High-geotemperature location tunnel, to applying in High-geotemperature location
Work brings huge challenge.
In high temperature hyperpyrexia location, the initial temperature of country rock is very high, and highest may be up to 100 DEG C, makes at liner structure concrete
In high temperature high-heat environment.In high temperature environments, the initial stage hydration rate of concrete is greatly improved, and the heat of hydration in concrete comes
Not as good as dispersing, initial set and final setting time shift to an earlier date, and early strength is higher, and hydrated product thing mutually changes, and the later stage of concrete is strong
Degree is reduced, and does not reach the intensity requirement of liner structure.Further, since hot environment, the surfaces externally and internally generation temperature of lining concrete
Degree is poor, produces temperature additional stress so that concrete cracking, the durability of concrete are substantially reduced.In highland thermally section, frequently
The outflow of high temperature crevice water is had, corrosion function is produced to concrete, further affect the life-span of concrete.
To solve the problems, such as that above-mentioned High-geotemperature is produced, some scholars start with from xoncrete structure, supporting in the early stage and lining cutting
Add one layer of heat preservation thermal insulation layer between structure, so as to reach heat-insulated purpose, it is ensured that the intensity of secondary lining concrete.Such as the patent No.
Tunnel lining double-decker concrete under a kind of underground heat eating condition disclosed in 201220214957.2, its construction enter in two steps
OK, first construction heat-insulating layer, then constructing structure layer, operational procedure slightly show complexity；201110148520.3 disclosed highland of the patent No.
The anti-heat release liner structure of warm speed, preliminary bracing injection heat-barrier material, be additionally provided between supporting and secondary lining in the early stage every
Thermosphere and the heat-insulated composite bed of guarded drainage, although this structure has good anti-exothermal effect, but constructing operation too complex.
The content of the invention
For above-mentioned technical problem, the present invention provides a kind of concrete, reach it is heat-insulated, construct simple High-geotemperature tunnel every
Hot lining concrete.Specifically technical scheme is：
The heat-insulated lining concrete in High-geotemperature tunnel, 1m3Contained raw materials quality is：300～380kg of cement, coarse aggregate 850～
1000kg, 450～550kg of sand, 200～220kg of waterglass, 8～12kg of glass bead, II grade of 50～150kg of flyash, steel
40～80kg of fiber, the third solidifying 3～5kg, 2～3kg of high performance water reducing agent of polyocarboxy acid.
Described cement be Portland cement, model PO42.5.
Rubble of the described coarse aggregate for continuous grading, particle diameter are 5～31.5mm.
Described glass bead is expanded and vitrified small ball, and specification is 80～120kg/m3, size is 1mm～3mm, is led
Hot coefficient is 0.048～0.070/W/ (mK).Glass bead is compensate for many defects and deficiency in Conventional insulation, is produced
The product later stage does not produce hollowing cracking, and fire protecting performance is good, and intensity is high, can relatively well make up concrete in High-geotemperature Under Concrete
Intensity decreases.
Described flyash adopts II grade of flyash, can substitute part Portland cement and make Binder Materials, improves
The workability of concrete mix, reduces contraction and the cracking of concrete, reduces the heat of hydration in concrete curing, mend well
Repay the later strength of concrete.
The strength grade of the incorporation and concrete of steel fibre need to make change according to the different of stress are required in engineering.
Described waterglass is sodium silicate (Na2O·nSiO2) aqueous solution, as binding agent, improve the intensity of concrete,
The thermostability of waterglass is preferable simultaneously.
Described third is solidifying as water-proof and anti-corrosive material, can effectively prevent and treat High-geotemperature location GEOTHERMAL WATER to lining concrete
Erosion, it is ensured that the durability of concrete.
Water-cement ratio is reduced with high efficiency water reducing agent dual mixing technology with II level flyash excessive replacements, mixed so as to balance two lining waterproofs
Coagulate the contradiction of low strong, the big fluidised form and impermeability of soil.
The preparation method of above-mentioned heat insulating concrete, comprises the following steps：
(1) prepare raw material, and check the quality of all raw material；
(2) by cement, sand, II grade of flyash, glass bead, third solidifying, high performance water reducing agent of polyocarboxy acid incorporation forced action type
Blender is stirred, and at the uniform velocity stirs 1.5min at a suitable rate, adds waterglass to stir while stirring.
(3) coarse aggregate and steel fibre are mixed in blender, at the uniform velocity stirs 2min at a suitable rate；
(4) by obtained concreting in lifts, height is poured for 40cm, and conserved under suitable conditions.
The present invention provide the heat-insulated lining concrete in High-geotemperature tunnel, surrounding rock supporting and it is heat-insulated combine, reduce
The difficulty of constructing tunnel, under High-geotemperature environment, with good heat-proof quality, while intensity will not be reduced, it is mixed after hardening
Solidifying soil intensity is higher, can reach the intensity requirement of lining concrete, improve the mechanical property under the conditions of concrete High-geotemperature；Together
When the concrete there is good waterproof, crack resistence performance.
Specific embodiment
With reference to embodiment and comparative example, the specific embodiment of the present invention is illustrated.
Embodiment 1
The heat-insulated lining concrete in High-geotemperature tunnel, 1m3Contained raw materials quality is as follows：
Cement 345kg, coarse aggregate 910kg, sand 478kg, waterglass 200kg, glass bead 10kg, II grade of flyash
100kg, steel fibre 80kg, the third solidifying 4kg, high performance water reducing agent of polyocarboxy acid 3kg.
The preparation method of above-mentioned heat resistance concrete, comprises the following steps：
(1) prepare raw material, and check the quality of all raw material；
(2) by cement, sand, II grade of flyash, glass bead, third solidifying, high performance water reducing agent of polyocarboxy acid incorporation forced action type
Blender is stirred, and at the uniform velocity stirs 1.5min at a suitable rate, adds waterglass to stir while stirring.
(3) coarse aggregate and steel fibre are mixed in blender, at the uniform velocity stirs 2min；
(4) by obtained concreting in lifts, height is poured for 40cm, and conserved.
After concrete curing 28d, it is 37.8MPa to measure its comprcssive strength, and free from flaw, waterproof effect are preferable.
To obtained concrete, one is placed on High-geotemperature geothermal environment, analog temperature be respectively 30 DEG C, 40 DEG C, 50 DEG C,
60 DEG C, 80 DEG C, while with GEOTHERMAL WATER, testing its effect of heat insulation, comprcssive strength, cracking situation, waterproof effect.
Test result is：(1) effect of heat insulation：The temperature change of the opposite side of concrete is little, as analog temperature is raised,
The temperature of opposite side is in rising trend, but the slope for rising is too little.(2) comprcssive strength：Test through compression experiment, concrete
Intensity is respectively 37.3MPa, 36.6MPa, 35.8MPa, 34.7MPa, 33.1MPa, and the comprcssive strength that can meet concrete is required.
(3) ftracture situation：Concrete is substantially free of cracking.(4) waterproof effect：Through observation, the anhydrous intrusion in inside of concrete.
Embodiment 2
The heat-insulated lining concrete in High-geotemperature tunnel, 1m3Contained raw materials quality is as follows：
Cement 300kg, coarse aggregate 1000kg, sand 450kg, waterglass 220kg, glass bead 8kg, II grade of flyash
50kg, steel fibre 40kg, the third solidifying 5kg, high performance water reducing agent of polyocarboxy acid 2kg.
The preparation method of above-mentioned heat resistance concrete, comprises the following steps：
(1) prepare raw material, and check the quality of all raw material；
(2) by cement, sand, II grade of flyash, glass bead, third solidifying, high performance water reducing agent of polyocarboxy acid incorporation forced action type
Blender is stirred, and at the uniform velocity stirs 1.5min at a suitable rate, adds waterglass to stir while stirring.
(3) coarse aggregate and steel fibre are mixed in blender, at the uniform velocity stirs 2min；
(4) by obtained concreting in lifts, height is poured for 40cm, and conserved.
Embodiment 3
The heat-insulated lining concrete in High-geotemperature tunnel, 1m3Contained raw materials quality is as follows：
Cement 380kg, coarse aggregate 850kg, sand 550kg, waterglass 210kg, glass bead 12kg, II grade of flyash
150kg, steel fibre 60kg, the third solidifying 3kg, high performance water reducing agent of polyocarboxy acid 2.5kg.
The preparation method of above-mentioned heat resistance concrete, comprises the following steps：
(1) prepare raw material, and check the quality of all raw material；
(2) by cement, sand, II grade of flyash, glass bead, third solidifying, high performance water reducing agent of polyocarboxy acid incorporation forced action type
Blender is stirred, and at the uniform velocity stirs 1.5min at a suitable rate, adds waterglass to stir while stirring.
(3) coarse aggregate and steel fibre are mixed in blender, at the uniform velocity stirs 2min；
(4) by obtained concreting in lifts, height is poured for 40cm, and conserved.
Comparative example 1
A kind of heat-insulated lining concrete in C30 High-geotemperatures tunnel, 1m3Contained raw materials quality is as follows：
Cement 345kg, coarse aggregate 910kg, sand 478kg, water 100kg, waterglass 100kg, glass bead 10kg, II grade
Flyash 100kg, steel fibre 80kg, the third solidifying 4kg, high performance water reducing agent of polyocarboxy acid 3kg.
After concrete curing 28d, its comprcssive strength is measured for 29.3MPa.Contrast with embodiment 1, when dry glass, mix
Solidifying soil intensity declines to a great extent, it is difficult to meet the requirement of strength design of concrete.
Comparative example 2
A kind of heat-insulated lining concrete in C30 High-geotemperatures tunnel, 1m3Contained raw materials quality is as follows：
Cement 345kg, coarse aggregate 912kg, sand 480kg, waterglass 200kg, glass bead 10kg, II grade of flyash
100kg, steel fibre 20kg, the third solidifying 4kg, high performance water reducing agent of polyocarboxy acid 3kg.
After concrete curing 28d, it is 35.9MPa to measure its comprcssive strength, and free from flaw, waterproof effect are preferable.With embodiment 1
Compare, steel fibre is reduced, concrete strength is reduced.When in the High-geotemperature environment that concrete is placed in described in embodiment 1, concrete
Side starts crack.
Comparative example 3
A kind of heat-insulated lining concrete in C30 High-geotemperatures tunnel, 1m3Contained raw materials quality is as follows：
Cement 345kg, coarse aggregate 910kg, sand 478kg, waterglass 200kg, glass bead 10kg, II grade of flyash
100kg, steel fibre 80kg, high performance water reducing agent of polyocarboxy acid 3kg.
After concrete curing 28d, its comprcssive strength is measured for 38.0MPa, free from flaw.Concrete is placed in into 1 institute of embodiment
In the High-geotemperature environment stated, inside concrete significantly has water to penetrate into, and is reduced by the concrete strength of water erosion side.
Compared with comparative example, the heat insulating concrete obtained by embodiment has the property of heat-barrier material and general lining concrete concurrently
Can, good heat-insulation effect, intensity are high, but also have cracking resistance, water resistance, and constructing operation is convenient, can be widely applied to High-geotemperature
In the Tunnel Second Lining concrete of geothermal area.
Claims (4)
1. the heat-insulated lining concrete in High-geotemperature tunnel, it is characterised in that 1m3Contained raw materials quality is：It is 300～380kg of cement, thick
850～1000kg of aggregate, 450～550kg of sand, 200～220kg of waterglass, 8～12kg of glass bead, II grade of flyash 50
～150kg, 40～80kg of steel fibre, the third solidifying 3～5kg, 2～3kg of high performance water reducing agent of polyocarboxy acid.
2. the heat-insulated lining concrete in High-geotemperature tunnel according to claim 1, it is characterised in that coarse aggregate is continuous grading
Rubble, particle diameter are 5～31.5mm.
3. the heat-insulated lining concrete in High-geotemperature tunnel according to claim 1, it is characterised in that described glass bead is
Expanded and vitrified small ball, specification are 80～120kg/m3, size is 1mm～3mm, and heat conductivity is 0.048～0.070/W/
(m·K)。
4. the heat-insulated lining concrete in High-geotemperature tunnel according to claim 1, it is characterised in that preparation method includes following
Step：
(1) prepare raw material, and check the quality of all raw material；
(2) by cement, sand, II grade of flyash, glass bead, third solidifying, high performance water reducing agent of polyocarboxy acid incorporation forced action type stirring
Machine is stirred, and adds waterglass to stir while stirring；
(3) coarse aggregate and steel fibre are mixed at the uniform velocity to stir in blender and concrete is obtained；
(4) by obtained concreting in lifts, height is poured for 40cm, and conserved.
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| CN110485377A (en) * | 2019-07-16 | 2019-11-22 | 中电建十一局工程有限公司 | A kind of light section canal lining construction method |
| CN110510954B (en) * | 2019-09-20 | 2020-11-27 | 长安大学 | High-strength sprayed concrete for high-ground-temperature tunnel and preparation method thereof |
| CN116283145A (en) * | 2023-03-14 | 2023-06-23 | 西南交通大学 | High-strength and high-toughness heat-insulation functional sprayed concrete for high-temperature hot water tunnel |
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| CN102199024B (en) * | 2011-04-29 | 2012-11-07 | 济南高新区工业废弃物利用研发中心 | Dry-mixed masonry mortar for industrial dust |
| CN103771785B (en) * | 2014-01-23 | 2015-07-15 | 太原理工大学 | Thermal-insulation steel fiber concrete and application and preparation method thereof |
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Inventor after: Chen Guoqing Inventor after: Liu Hui Inventor after: Liu Ding Inventor after: Zhao Cong Inventor after: Li Tianbin Inventor before: Chen Guoqing Inventor before: Liu Hui Inventor before: Zhao Cong Inventor before: Li Tianbin |
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